question_answer

What should be subtracted from \[\left( 6{{x}^{2}}\,+\,9{{y}^{2}}\,-\,5xy \right)\] to get \[\left( -\,{{x}^{2}} \right)\,?\]

A)  \[\left( 7{{x}^{2}}\,-\,9{{y}^{2}}\,-\,5xy \right)\]         

B)  \[\left( 7{{x}^{2}}\,+\,9{{y}^{2}}\,-\,5xy \right)\]

C)  \[\left( 7{{x}^{2}}\,+\,9{{y}^{2}}\,+\,5xy \right)\]     

D)  \[\left( 7{{x}^{2}}\,+\,9{{y}^{{}}}\,-\,5xy \right)\]

E)  None of these